Miscellaneous
Clear Cache
Clear data cached in GPU Memory (texture and VBO Objects).
Currently, textured data and geometry data for height field are automatically stored in GPU and reused.
In this way, when it is called by other objects later, thier response is much faster than reconstruct them each time.
However, releasing of unnecessary data (garbage collection) is not implemented yet.
Thus, you may have to relase them by hand some times.
return
